m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 418

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

(5) Block erase command
(6) Erase-all-blocks command
Writing of command code “20
cycle and “D0
A
bus cycle initiate the automatic erase (erase
and erase-verify) operation for the specified
block. During the automatic erase operation,
be sure not to access the flash memory or not
to execute the next command. The completion
of the automatic erase operation can be
recognized by the RY/BY status bit (bit 0 at
address 9E
After the automatic erase operation is completed,
the result of it can be recognized by reading
out the status register. (Refer to section “19.2.5
Full status check.”)
Figure 19.2.4 shows the block erase operation
flowchart.
Writing of command code “20
cycle and “20
the automatic erase (erase and erase-verify)
operation for all the blocks. During the automatic
erase operation, be sure not to access the flash
memory or not to execute the next command.
The completion of the automatic erase operation
can be recognized by the RY/BY status bit (bit
0 at address 9E
After the automatic erase operation is completed,
the result of it can be recognized by reading
out the status register. (Refer to section “19.2.5
Full status check.”)
Figure 19.2.5 shows the erase-all-blocks
operation flowchart.
0
= 0) of the block to be erased at the 2nd
16
).
16
16
” to the highest address (here,
” at the 2nd bus cycle initiate
16
).
16
16
” at the 1st bus
” at the 1st bus
7905 Group User’s Manual Rev.1.0
19.2 Flash memory CPU reprogramming mode
Fig. 19.2.4 Block erase operation flowchart
Fig. 19.2.5 Erase-all-blocks operation flowchart
FLASH MEMORY VERSION
“D0
operation is completed.
Block erase operation is
RY/BY status bit = “1”?
16
RY/BY status bit = “1”?
address of the block.
(bit 0 at address 9E
” is written to the highest
Erase-all-blocks
(bit 0 at address 9E
Full status check
Command code
“20
Full status check
“20
Command code
“20
completed.
16
16
16
” is written.
” is written.
Start
Start
” is written.
YES
YES
16
16
)
)
••• See Figure 19.2.6.
••• See Figure 19.2.6.
NO
NO
19-15